/Engine/Source/Runtime/CoreUObject/Public/Serialization/DerivedData.h
Returns the cache key for the request. Null if not applicable, executing, failed, or canceled.
const [DerivedData::FCacheKey](API\Developer\DerivedDataCache\FCacheKey) * GetCacheKey ( [FDerivedDataIoRequest](API\Runtime\CoreUObject\Serialization\FDerivedDataIoRequest) Handle ) const